Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 31
ar magnet. Sometimes the needleis suspended from a vertical support by a cocoon silkfibre, in which case it is much more sensitive, due to theelimination of the friction in the poised form. Both types ■are much used commercially in electrical detecting andmeasuring instruments, as in the mariners… … 0=|!=€3 Fig. 19.—Magnetic Dip Needle. Fig. 20.—Magnetic Dip Needle. Centre of the lozenge at right angles to it, and is held in posi-tion by brass V centres, or agate bearings, as shown in Figs.19 and 20. It is thus free to turn vertically. In some typesthe cradle holding the horizontal shaft is…
Electricity · Magnetism
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